Psalms 141:3
Set a guard, O Lord, over my mouth;
Keep watch over the door of my lips.

The quote from Epictetus applies here, “We have two ears and one mouth so that we can listen twice as much as we speak.”
The mouth gets people in more trouble than anything else.
David asked the Lord to set a guard over his mouth.
A guard insures safety.
A prison guard keeps dangerous elements of society from escaping.
An army private standing guard insures the
Some people have the inability or desire to say nothing when nothing is all that needs saying.
It is imperative for a Christian to watch what he/she says.
It’s just as important to note how you say things.
Strong emotional responses are the worst. Words hurt when said in anger, jealousy, envy, or hatred.
You never really need to get that last word in. Just leave it alone – let it lie there.
If it is a problem, pray as David for the Lord to keep watch over your mouth.